There is a common 'Ham-myth' that doubling the number the number of elements doublesįield strength (3dB more gain). Understand how antenna systems produce gain. Stacking (broadside) or collinear antennas, we Yagi antennas, W8JK arrays, and log periodic dipole arrays are allĮnd fire arrays. They fire in the direction of the boom through the plane While a collinear array is a broadside array, the termīroadside is generally reserved for non-collinear arrangements.Įnd fire arrays are arrays with elements arranged in a row, running in the direction(s) of maximum

The 5/8th wave is collinear with the ground reflection image.īroadside is used to describe pattern in relationship to spatial area Extended double Zepps and two half waves in phaseĪre examples of collinear arrays. A 5/8th wave radiator, which developes gain when placed over an infinite ground plane through ground reflection image, is also a collinear. This Blog is mainly dedicated to Amateur Radio (Ham radio) and contains external articles and personal esperiences.There are three primary types of arrays, collinear, broadside, and end fire.Īrranged in a straight line. IT System Engineer, recently started having fun with morse code and Raspberry Pi Licensed Amateur Radio operator in 1996 as IW5EDI, active member of ARI Firenze and ARRLĬlass 1970, married with two childrens, love experimenting and antenna home-brewing. Step-By-Step Construction of a 4:1 Current-Type Balun.Ultra-portable 5ele 144MHz Pocket Portable Yagi.160 Meter linear loaded Tee vertical doublet antenna.I was trying to increase the overall performance of the J-pole, in this design.Â The diagram provided is a more simplified version of the one I did.Â These are a few of the modifications I came up with.Â I added a cap on the top end of the PVC.Â Mounted a so-239 to a split piece of copper tubing, that took the place of the #14 copper wire.Â And, I also added a short aluminum mast that fit into the lower end of the PVC.Â Â I mounted the antenna to a 10′ antenna mast and a small tripod on the roof.Â I tried to add some type of a ground plain but everything I did made the antenna perform poorly.Â After all my efforts the end result was an antenna that out performs the 1/2-wave colinear copper version, with only one exception.Â The working model is somewhat narrow banded and still requires more experimentation.Â Some of the elements must be a little long.

Collinear antenna design